Shoe and method of shoemaking



Dec. 15, A1936. M GREEN A2,064,256

y SHOE AND METHOD OF SHOEMAKING Filed Oct. 12. 1955 Patented Dec. 15, 1936 UNETED STTES reizt PATENT oFFicE SHOE AND IVIETHOD OF SHOEMAKING Application october 12, 1935, serial No. 44,717

3 Claims.

This invention relates to the art of shoe making and more particularly to the type of shoes known as compo shoes wherein the sole is secured to the upper by an adhesive.

Adhesive cements which have been developed during recent years are waterproof and of suf'n-y cient strength to make possible the satisfactory use thereof in securing a shoe sole to the upper. The cemented bond between the sole and upper is usually satisfactory when the sole is of a good grade of leather. When poor or medium grades of leather are used, however, the flesh side of the leather sole is liable to be surfaced by relatively long loose fibers which are apt to pull away from the body of the leather under stress. Hence, some diiculty has been experienced in forming a strong cemented bond between shoe soles and the uppers where medium grades of leather have been employed for the soles.

It is an object of the present invention to provide simple but effective means for strengthening the bonding of the sole to the upper, regardless of the quality of leather used in the sole. To this end, a line of stitching is run along the margins of the shank and forepart of the sole, the portions of the loops of stitching which are exposed on the upper face of the sole being adapted to be impregnated with the cement or adhesive material employed to cement the sole to the upper. When the sole is pressed against the lasted upper, these impregnated exposed portions of the loops of stitching are pressed into direct engagement with the over-lasted portions of the upper and form therewith a strong bond. Since the stitching goes through the sole, the entire sole is thus secured to the upper regardless of the quality of the flesh surface of the sole stock which is against the lasted upper.

If desired, a more effective bonding between the sole and upper may be secured, according to the invention, by stitching a strip of tape or other suitable material of suiiicient strength along the margins of the shank and forepart of the sole. This tape should be of a material such as a woven textile, adapted to adhere strongly to the kinds of cement customarily employed in the making of compo shoes. The tape, being anchored to the sole by the stitching which goes through the sole, aids the stitching in firmly uniting the sole to the upper.

For a more complete understanding of the invention, reference may be had to the following description thereof and to the drawing of which vdicated in Figure 1.

(ci. liz-142) Figure 1 is a fragmentary plan view of a shoe sole embodying the invention.

Figure 2 is a sectional view on the line 2 2 of Figure 1. i

Figure 3 is a sectional view of a shoe includ-V .i

ing a sole such as is illustrated in Figure 2.

Figure 4 is a sectional View, similar to Figure 3, showing a slightly modied form of invention.

Figure V5 is a rfragmentary sectional vView showing a portion of Figure 4 ona larger scale.

Figure 6 is a plan view of a portion of a shoe sole embodying a modied form'ofthe invention.-

Figure 7 is a section on the line'I-.Tof Figure 6.

Figure 1 of the drawing illustrates a shoe sole I0, preferably of leather, the flesh or upper surface thereof being shown on the drawing. After the sole has been cut to shape, a line of stitching II is run along the margins of the shank and forepart of the sole I0, this stitching being of loops of coarse thread extending through the f sole so that portions of these loops are exposed on the bottom face of the sole and other portions are exposed on the upper face of the sole as in- Any preferred type of stitching, such as a lock stitch or a chain stitch, may be employed. After the line of stitching II has Vbeen made on the sole I0, a lm I2 of liquid cement or adhesive material is applied to the marginal portion of the upper face of the sole I0 so as to impregnate the portions of the stitch-` ing loops exposed on the upper face and to cover the marginal areas of the upper face of the sole adjacent to the line of stitching. If desired, this adhesive maybe allowed to dry and may be later activated by the use of a suitable solvent immediately prior to the application of the sole to a lasted upper.

Figure 3 illustrates in section a shoe including a sole I0 having stitching II as hereinbefore described, the sole being adhesively pressed against the upper I5 with its lining I6 so that the film I2 of adhesive and the impregnated portions of the stitching II are pressed directly against the over-lasted portion of the upper I5. This direct engagement of the stitching II with the4 over-lasted portion of the upper strengthens the bond between the sole and the upper, since the adhesion of the stitching to the upper is independent of the quality of the surface ofthe sole leather.

If desired, in addition to the stitching Il in the sole, the over-lasted portion of the upper I5 may also be stitched as at 20, either before or zoY after the lasting operation, the stitching 2G being so arranged as to be directly opposite the stitching Il in the sole when the sole is adhesively pressed against the lasted upper. The firm cemented adhesion between the thread loops of the upper greatly strengthens the bond between the sole and the upper.

Additional strengthening means may be provided, if desired, as indicated in Figures 6 and '7. Prior to the stitching of the sole, a strip of tape 25 may be applied to the marginal portions of the upper face of the sole so that the stitching I I will mechanically anchor the strip 25 to the sole IU. The strip thus provides a wider line of contact than the stitching alone for adhesive bonding with the lasted upper. The cement I2 which is applied to the margin of the sole assists the stitching in irmly anchoring the strip 25 to the sole, so that, when the sole is pressed into adhesive contact with the lasted upper, the presence of the impregnated strip 25 greatly strengthens the bond between the sole and the upper.

While leather has been hereinbefore mentioned by Way of example as material for the sole I0, it is to be understood that the invention is not to be limited to that or any other material, but may include rubber, composition, or any other suitable sole material. It is evident that various other modifications and changes may be made in the invention, without departing from the spirit or scope thereof as dened in the following claims.

I claim:- Y

1. A method of making shoes, which comprises stitching through a shoe sole along the margins of the shank and forepart thereof, so that portions of the loops of stitched thread are exposed on the upper face of the sole, applying an adhesive to marginal portions oi. the upper face of said sole including the loops exposed thereon, and pressing said sole into adhesive contact with a lasted upper so that said exposed loop portions directly engage the overlasted portion of the upper.

2. A method of making shoes, which comprises stitching through a shoe sole along the margins of the shank and forepart thereof, so that portions of the loops of stitched thread are exposed on the upper face of the sole, stitching through the portion of a shoe upper which is to be over-lasted on the last, lasting said upper, and cementing the sole to the upper so that the stitching in the sole is in direct contact with and is cemented to the stitching in the over-lasted portion of the upper,

3. A shoe comprising an outer sole and an upper having a lasted portion, said outer sole having a line of stitching therethrough along the margins of the shank and forepart thereof to strengthen and reinforce the sole material, portions of the stitching being exposed on the upper face of the sole, and a lm of cement impregnating said exposed portions of the stitching and adhesively uniting said lasted portion with the upper face of the sole and Vwith said stitching, the stitching serving to strengthen the adhesive bond between the lasted portion and the sole and to secure the entire thickness of the sole to the lasted portion.

MORRIS GREEN. 

